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Building/Printing a Bar Code

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Getting Started

Building/Printing a Bar Code

This section describes the methods used to build/print bar codes.

Building a Bar Code

The Bar Code Printing function generates bar codes according to the set PCL font

parameters. The PCL font parameters used in this system differ from the generally accepted

standards, except for the v and T parameters. The T parameter selects the bar code format,

while the v parameter controls the bar height and the number of rows or columns that are

used for the bar code.

Some formats require a checksum. A checksum is a value, which is the result of a complex

calculation of the coded data. This value is added to the end of the coded data and used by

a code reader to validate the bar code. This system automatically calculates the

checksum(s) of bar codes that need it. Bar codes can have up to two checksums (MSI

Plessey and UCC128). If the checksum is included in fixed length data (EAN 8/13 and UPC),

it is ignored.

If required, the system prints the checksum value as centerd text with the bars, either as

half-embedded or fully embedded characters, and located either under or above the bars.

Checksum and flag characters are automatically placed in the right position in some systems

(EAN 8/13 and UPC), according to international standards. Automatic sizing limits the

embedded text point size to 15. There is no size limit for text that is located above or under

the bar code.

Data is analyzed to verify whether it conforms to the following bar code specifications:

• The data must be of the correct size, depending on the desired format. For example,

Interleaved 2 of 5 must have an even number of digits, whereas

EAN 8/13 and UPC have fixed lengths.

• The data must be valid. Some systems, such as UPC-E, accept only specially structured

data. For example, the first five digits on the left side of the bar code are calculated based

on the equivalent UPC number.

• Data consists of only numeric or alphanumeric characters.

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Canon MF820Cdn User's Guide Page 15